It is possible to install Atom on the Raspberry Pi.
I did it on Ubuntu Mate (but I guess it works the same way with Raspian).

Instructions

Install all the dependencies.
You got to install some dependencies with the terminal emulator.sudo apt-get install build-essential git libgnome-keyring-dev fakeroot gconf2 gconf-service libgtk2.0-0 libudev1 libgcrypt20 python rpm npm npm-cli apm nodejs
Set the python path:npm config set python /usr/bin/python2 -g
Install node-gyp:npm -g node-gyp
Note that node-gyp made an issue here, you need to install it also in the project folder, otherwise you will have build errors.

Download the source.git clone https://github.com/atom/atom.git

Navigate into the source folder.cd atom

Install node-gyp locally.npm install node-gyp

Build the source../script/build
If this gives you issues try with sudo.sudo ./script/build

Install Atom.
If everything builds correctly you will get a folder named “out”.
Now run the install script.sudo script/grunt install
This installs atom into the folder “usr/local/bin”

Add the Icon Menu.
According to your window manager this is different.
I used mate to add my icon.
You may check if the system finds the program and the icon automatically, then you don’t need to add the item in the menu.
Otherwise right-click into the main menu.
Click edit menu.
Select the category where you want to place atom. Maybe use “development”.
Click add item.
Now select the icon. The atom icons are in the folder called “atom/out/icons”.
Name it “atom”.
Command:usr/local/share/atom/atom %F.
Command: “Atom editor” or whatever you like.

That’s it!
Now start atom an see if it is working.
If you run into problems, see the issues below. Otherwise write a comment.